Burglar alarm for windows and doors



M y 10, 49. R. .SUMA, SR 2,469 528 BURGLAR ALARM FOR WINDOWS AND DOORS Filed Feb. 27, 1948 A I h I II II II [I II II II I Juli... A J L j7-j LII Ill 2 38 FAG. a.

INVENTOR. A2 THU/e 2. 80/144, $42.

ATTO/P/VEYS.

Patented May 10, 1949 OFFICE BURGLAR ALARM WINDOWS AND DOORS Arthur R. Suma, Sr., Chicago, Ill.

Application February 27, 1948, Serial No. 11,404

2 Claims. 1.

This invention relates to burglar alarms, and more particularly to mechanical burglar alarms operable to sound a warning whenever a door or window guarded by the alarm is opened.

A main object of the invention is to provide a novel and improved burglar alarm which avoids the use of electrical connections and which is simple in construction, easy to install and reliable in operation.

A further object of the invention is to provide an improved burglar alarm of the mechanical type which is inexpensive to manufacture, sturdy in construction, and very easy to set for operation, the alarm being very inconspicuous in appearance and compact in size.

Further objects and advantages of the invention will become apparent from the following description and claims, and from the accompanying drawings, wherein:

Figure 1 is a perspective view of a portion of a window showing an alarm device constructed in accordance with the present invention installed thereon.

Figure 2 is an enlarged vertical longitudinal cross-sectional view taken through the alarm device of Figure 1.

Figure 3 is a horizontal cross-sectional view, with parts broken away, of the alarm device of Figure 1.

Referring to the drawings, l I designates a gen erally rectangular housing having a bottom wall l2, a top wall It, a front end wall M, side walls 15 and I6 and a relatively thick rear wall H, the length of the housing being sufficient so that when it is positioned on the top sill l8 of the lower sash of a window, in the manner shown in Figure l, the rear portion of the housing overlies the lower sill H) of the top sash of the window. laterally from the housing at its bottom plane are apertured lugs Zll, 20 and projecting from the front wall [4 at said bottom plane is a bendable apertured lug 2|. The housing I! may be secured to the top sill It of the lower sash of the window by wood screws or the like passing through the apertur'ed side lugs 2t, 2t and the lug 2|, said lug 2| being bent to a depending position whereby it abuts the front vertical surface of sill l8.

Secured to the forward portion of bottom wall I2 is a vertical sleeve 22 and rotatively positioned therein is a vertical shaft 23. Shaft 23 has a squared top portion 24 which projects into an opening 25 formed in top wall l3, whereby a suitable key 26 may be engaged with said squared top portion 24 in the manner shown in Figure 2.

Projecting 2 Shaft 23 has secured thereto a collar 2'! which rotatively supports the shaft on the top of sleeve 22.

Rotatably supported on shaft 23 is a drum-like housing 28 carrying a ring gear 29 at its bottom plane. Contained inside housing 28 is a spiral spring 33, the inner end of said spring being secured to shaft 23 and the outer end thereof being secured to the peripheral wall of housing 28. Rigidly secured to said shaft upwardly adjacent the top wall of housing 28 is a ratchet disc 3L Pivoted to said top wall at 32 is a pawl 33 biased into engagement with the teeth of disc 3| by a leaf spring 34 carried by the top wall of housing 28 and bearing inwardly on pawl 33.

Designated at 35 is a detent member slidably positioned in an opening formed in wall M in the plane of ring gear 29. A spring 3% secured to wall M bears on the shank of detent member 35 and exerts frictional pressure thereon. Detent member 35 is formed with a head 31 and its shank is annularly grooved at 38 adjacent said head. By pushing inwardly on head 37 the inner end of the detent member may be caused to interlock with the teeth of ring gear 29 to thereby hold housing 28 stationary. At the same time, the end of spring 36 interlocks with groove 33 so that housing 28 cannot be released except by manually retracting head 31. A stop abutment 39 on the shank of detent member 35 prevents withdrawal of said detent member from its supporting aperture in wall I4.

When the housing 28 is locked by detent member 35, the spring 30 may be Wound up by means of the key 26. I

Journalled in housing I! is a vertical shaft i0 carrying a pinion gear til which meshes with ring gear '29 and carrying also a toothed disc 42. Designated at 53 is a vertical shaft rotatably supported in housing II, to which is secured a yoke member 4 3 having escapement arms and 46 alternately engageable with the toothed periphery of disc 42 and acting to oscillate shaft 43 responsive to rotation of said disc.

Secured to and depending from top wall; 13 of housing I Tis a bell 41 and secured to shaft 43 is a striker 48. When shaft 43 is oscillated as above described, the striker 48 intermittently strikes bell 41 producing a loud audible signal.

Rear wall I! is formed with a vertical bore 49 in which is slidably positioned a plunger 50 biased downwardly by a spring 5| acting between the top of plunger 50 and the top wall of bore 49. Pivotally connected at 52 to the upper portion of plunger 50 is one end of an arm 53 extending through a vertical slot 54 formed in wall I! between bore 49 and the inner cavity of housing H. The other end of arm 53 is pivoted at 55 between vertical upstanding brackets 56, 56 secured to bottom wall l2. Arm 53 is formed with an upstanding lug 51 engageable behind yoke member 44 adjacent arm 46 to lock said yoke member in engagement with toothed disc 42 when plunger 50 is in the elevated position thereof shown in Figure 2.

Since ring gear 29 is in mesh with pinion 4|, housing 28 is also looked when plunger 50 is in its elevated position, whereby spring 30 may be Wound under these conditions even if detent member 35 is in the retracted position of Figures 2 and 3'.

In operation, the spring 3|] is first wound up by means of the key 20, either by locking the ring gear 29 by interengagement with detent member 35, as above described or by maintaining plunger 50 in its elevated position. With the window in fully closed condition, as shown in Figure 1, plunger 50 will be held in elevated position by engagement with the lower sill it of the top sash of the window. To set the alarm, detent member 35 is pulled out to the position shown in Figures 2 and 3. When either the top sash or the lower sash of the window is sub-- sequently opened, plunger 50 will be released, allowing spring 5| to expand, whereby arm 53 rotates downwardly and disengages lug 51 from yoke member 44. Since the yoke member is released, disc 42 is unlocked, allowing spring 30 to expand. Housing 28 rotates, transmitting torque to disc 42 through ring gear 29 and pinion ll. Rotation of disc 42 oscillates yoke member 44, causing the striker 48 to intermittently strike bell 41 and produce the audible alarm signal.

While illustrated herein as employed on a window, the signal device may also be employed with a door by positioning it so that plunger 50 abuts the door while it is closed and is released by the opening of said door.

While a specific embodiment of a burglar alarm signal device has been disclosed in the foregoing description, it will be understood that various modifications within the spirit of the invention may occur to those skilled in the art. Therefore it is intended that no limitations be placed on the invention except as defined by the scope of the appended claims.

What is claimed is:

1. In a burglar alarm for a window or the like having a sash or the like movable to open position relative to another sash or the like; a housing adapted to be fixedly mounted on one of the sashes, a clockworks within said housing having an escapement wheel, an escapement pivoted to alternately engage and disengage from said escapement wheel, a stop lever pivoted in said housing and arranged to engage said escapement in one position of said lever to render said clockworks inoperative and to disengage from said escapement in another position of said lever and permit said clockworks to operate, an audible signal operatively connected to said clockworks, a plunger mounted for endwise movement in said housing and in position to be engaged and displaced by a portion of the other sash or the like when the sashes are brought into closed relation, means operatively connecting said plunger and said stop lever, spring means normally passing said plunger outwardly of said housing whereby said stop lever is disengaged from said escapement so that operation of said audible signal by said clockworks is permitted, said plunger being arranged to be displaced inwardly of said housing against the tension of said spring means so as to move said stop lever into engagement with said escapement and render said clockworks inoperative whenever said plunger is engaged and displaced by said portion of the other sash or the like as the sashes are brought into closed relation.

2. In a burglar alarm for a window or the like having a sash or the like movable to open position relative to another sash or the like; a housing adapted to be fixedly mounted on one of the sashes, a clockworks within said housing having an escapement wheel, an escapement pivoted to alternately engage and disengage from said escapement Wheel, a stop lever pivoted in said housing and arranged to engage said escapement in one position of said lever to render said clockworks inoperative and to disengage from said escapement in another position of said lever and permit said clockworks to operate, an audible signal operatively connected to said clockworks, a plunger mounted for endwise movement in said housing and in position to be engaged and displaced by a portion of the other sash or the like when the sashes are brought into closed relation, means operatively connecting said plunger and said stop lever, spring means normally pressing said plunger outwardly of said housing whereby said stop lever is disengaged from said escapement so that operation of said audible signal by said clockworks is permitted, said plunger being arranged to be displaced inwardly of said housing against the tension of said spring means so as to move said stop lever into engagement with said escapement and render said clockworks inoperative whenever said plunger is engaged and displaced by said portion of the other sash or the like as the sashes are brought into closed relation, said audible alarm comprising a sounder and a hammer mounted on said escapement.

ARTHUR R. SUMA, SR.

REFERENCES @ITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 606,862 Gray July 5, 1898 688,825 Clark Dec. 17, 1901 870,063 Uhlmann Nov. 5, 1907 1,287,871 Butcher Dec. 17, 1918 

